宝石能谱CT自适应统计迭代重建技术在儿童副鼻窦扫描中的应用

发布时间：2018-05-31 11:22

本文选题：计算机体层摄影 + 自适应统计迭代重建　；参考：《山东医药》2017年04期

【摘要】：目的探讨儿童副鼻窦宝石能谱CT扫描时,自适应统计迭代重建(ASIR)算法的最适宜低剂量参数搭配。方法筛选100例行宝石能谱CT扫描的副鼻窦患儿,随机分为五组各20例。常规剂量组采用120 k V、90 m A扫描,滤波反向投影(FBP)重建图像;低剂量A、B、C、D组分别采用100 k V、85 m A,100 k V、50 m A,80 k V、85 m A,80k V、50 m A扫描,对原始数据采用ASIR算法(60%)进行重建,其余条件不变。记录五组CT容积剂量指数(CTDIvol)及剂量长度乘积(DLP);比较图像的辐射剂量及图像噪声、对比噪声比(CNR)。结果四个低剂量组60%ASIR与常规剂量组FBP辐射剂量比较明显减低,低剂量A、B、C、D组较常规剂量组CTDIvol分别降低了38.92%、63.81%、66.01%、80.04%;DLP分别降低了39.78%、64.83%、66.25%、80.23%;低剂量A、B、C组图像质量主观评分与常规剂量组比较差异均无统计学意义(P均0.05),均能满足临床诊断要求;低剂量D组图像质量主观评分较常规剂量组明显降低,噪声明显升高,图像不能满足临床诊断要求。结论儿童副鼻窦宝石能谱CT扫描ASIR算法权重比例为60%时,最适宜低剂量参数为80 k V、85 m A。
[Abstract]:Objective to investigate the most suitable low dose parameter collocation of adaptive statistical iterative reconstruction (ASIR) algorithm in children's paranasal sinuses with CT scan. Methods 100 children with paranasal sinuses were randomly divided into five groups of 20 cases each. The routine dose group was treated with 120 K V, 90 m A scan, filtered back projection (FBP) reconstruction image, and low dose A. The B, C, and D groups used 100 K V, 85 m A, 100 K V, 50 m A, 80 K, 50, 60% for reconstruction, and the rest of the condition unchanged. Record five groups of volume dose index and dose length product; compare the radiation dose and image noise of the image, compare the noise ratio, and four lower results. Dose group 60%ASIR and routine dose group FBP radiation dose decreased significantly, low dose A, B, C, D group CTDIvol decreased by 38.92%, 63.81%, 66.01%, 80.04%, DLP decreased 39.78%, 64.83%, 66.25%, 80.23%, low dose A, B, C group image quality subjective score and conventional dose group have no statistical significance (P is 0). .05) can meet the requirements of clinical diagnosis. The subjective score of image quality in low dose D group is significantly lower than that of the conventional dose group, and the noise is significantly higher, and the image can not meet the clinical diagnostic requirements. Conclusion the most suitable low dose parameter is 80 K V and 85 m A. when the weight ratio of the CT scan ASIR algorithm of the paranasal sinuses in the paranasal sinus is 60%.
【作者单位】：聊城市第二人民医院;
【基金】：山东省医药卫生科技发展计划项目(2014WS0308)
【分类号】：R816.96;R765.4

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